User blog comment:FluffyMermaid78/Ask Mew!/@comment-32658700-20180106003607/@comment-32658700-20180106222530

Also

According to actual Pokémon lore, Arceus was the first pokemon as an egg and used the help with a bunch of unown to create Dialga, Palkia and Girantina. Giratina was bad and was banished to the distortion world.

Arceus also created the lake trio and Arceus went into a deep slumber. The weather trio were now born from hot magma, deep sea pressure and the o zone layers respectively. Of course this is when they fight and rayquaza has to calm them down

Then that’s when loads of mew popped up which eventually evolved (in the Darwinian version) into some fossil pokemon. That made mew less common until now when they are almost impossible to find.

Saw this on bulbapedia. It’s actually proven true by the canalave library in Pokémon diamond, pearl and platinum. It’s actually pretty interesting. This leads me to think mew is the ancestor of MOST pokemon. This is because it never existed when some mythicals and legendaries

Listen to what the guy above said